A searing, blinding jolt of sensual pleasure shot through her cunt as her finger touched the tiny nub. It was all Lucinda could do to keep from shrieking out her pleasure as an overpowering spasm of joy tore through her virginal pussy.

Frightened by the intensity of her body's reaction, Lucinda took her hand out of her shorts and hastily brought her attention back to the keyhole, hoping the strange new sights and sounds there would distract her from the newfound joys waiting just inside her cunt-lips. She knew that it was terrible for a girl to "play with herself".

Dawn and Steve Collins obviously didn't give a hot Goddamn about what was right and what was wrong. Lucinda realized abruptly as she looked back through the keyhole. Steve was hunching up off the mattress with each thrust, really cramming his big prick up into his older sister's tight cunt with each new stroke. Dawn was enjoying every pussy-reaming minute of it, too. Lucinda could see that clearly from the expression of utterly depraved joy stamped across the lovely eighteen-year-old's face as she rode the fat cock frantically.

Lucinda felt hot waves of sensation flooding through her pussy as she watched the wanton display again. The hot feelings weren't quite as sharp nor as intense as the one that had tipped through her when she had first fingered her cunt, but they were quite thrilling all by themselves.

"God, if it feels this good just watching, and so incredible just touching myself down there…" Lucinda's whisper-trailed off. "How good it must feel, actually getting a big cock stuck up in there again and again, like Dawn is getting now!"

Lucinda shivered with lust at the mere thought of how terrific that must feel. No wonder Steve and Dawn were fucking each other, despite all the taboos about incest.